From: Xi Ruoyao <xry111@xry111.site>
Date: Sat, 15 Apr 2023 11:55:50 +0000 (+0800)
Subject: build: Use -nostdinc generating macro_list [PR109522]
X-Git-Tag: basepoints/gcc-15~9595
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=be6c13d5cef6fd9ca97dea7a6f5fbf93c51235b5;p=thirdparty%2Fgcc.git

build: Use -nostdinc generating macro_list [PR109522]

This prevents a spurious message building a cross-compiler when target
libc is not installed yet:

    cc1: error: no include path in which to search for stdc-predef.h

As stdc-predef.h was added to define __STDC_* macros by libc, it's
unlikely the header will ever contain some bad definitions w/o "__"
prefix so it should be safe.

gcc/ChangeLog:

	PR other/109522
	* Makefile.in (s-macro_list): Pass -nostdinc to
	$(GCC_FOR_TARGET).
---

diff --git a/gcc/Makefile.in b/gcc/Makefile.in
index 9300b3ee7f5d..17486585813f 100644
--- a/gcc/Makefile.in
+++ b/gcc/Makefile.in
@@ -3254,7 +3254,7 @@ install-gcc-tooldir:
 
 macro_list: s-macro_list; @true
 s-macro_list : $(GCC_PASSES) cc1$(exeext)
-	echo | $(GCC_FOR_TARGET) -E -dM - | \
+	echo | $(GCC_FOR_TARGET) -nostdinc -E -dM - | \
 	  sed -n -e 's/^#define \([^_][a-zA-Z0-9_]*\).*/\1/p' \
 		 -e 's/^#define \(_[^_A-Z][a-zA-Z0-9_]*\).*/\1/p' | \
 	  sort -u > tmp-macro_list